Viewing contents of Default Admin Set on admin dashboard raises exception

[bess]

See https://github.com/curationexperts/nurax/issues/32

• [x] Test this and see if it fixes the issue
• [ ] if it does, document it, for this project and future work

[bess]

• Viewing contents of Default Admin Set on admin dashboard raises exception https://github.com/samvera/hyrax/issues/2446